1. Zeger SL, Diggle PJ. Semiparametric models for longitudinal data with application to CD4 cell numbers in HIV seroconverters. Biometrics. 1994;50:689–99.
2. UNAIDS. Global Health report: UNAIDS report on global AIDS epidemic.
http://www.unaids.org/sites/default/files/media_asset/UNAIDS_Global_Report_2013_en_1.pdf
.
3. UNAIDS. Report on the global AIDS epidemic 2012: joint United Nations Programme on HIV/AIDS. Geneva: Switzerland; 2012. p. 2012.
4. WHO fact sheet 2012.
http://www.who.int/mediacentre/factsheets/fs360/en/index.html
.
5. Unaids J. Global report: UNAIDS report on the global AIDS epidemic 2010. Geneva: UNAIDS; 2010.